Please visit my web page "Urban Tenets" at https://urbantenets.nl/
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It might seem unethical, disruptive and amusing at the same time but if ten odd seconds of non-invasive commercial slideshow break or selling commercial right of part of slide, during acedemic presentations across universities and colleges could generate fund for education or healthcare in remote corners of world its an idea worth considering, academic community with students as potential customer base shall cooperate wholeheartedly one feels.